Air filter



Nov. 13, 1945. v

H. PEABsoN AIR FILTER Filed Aug. 25, 1944 2 Sheets-Sheet 1 ||l..| l Illl IH ulrlllnnllulelvhlluslavv In ven-bor H. Pe/fan/ Nov. 13, 1945.*vl-l. PEARsoN 2,388,933

AIR FILTER Patented Nov. 13, 1945 AIR FILTER Herbert Pearson,Liversedge, England Application August 23, 1944, Serial No. 550,783 InGreat Britain August 19, 1943 2 Claims.

This invention has for its object to provide an improved filterparticularly advantageous for use for filtering air passing to thecarburettors of internal combustion engines.

A filter in accordance with my invention comprises a sump or vesselfilled with oil and/or a carbon inhibitor and a sheet or sheets offiltering fabric through which the air passes, produced from knitted orwoven composite strands, each consisting of one or more textile threadsor yarns and one or more lengths vof fine metal wire, lying alongsideone another (as described and claimed in my application for patentSerial No. 447,834), the textile threads or wicks attached theretodipping into the liquid in the sump or vessel so that the textilethreads are wetted by capillary attraction.

Referring to the accompanying explanatory drawings:

Figure 1 is a sectional side elevation, Figure 2 an end elevation, andFigure 3 a plan view of a filter constructed in one convenient form inaccordance with this invention.

proved ltering fabric thereon at opposite sides so that the air beingltered which enters at d and leaves at e passes through the fabrics onits way to the engine Carburettor. 'I'he filtering fabric comprisestextile threads f which lie alongside metal wire g, the latter giving astrength to the composite fabric. The textile threads distribute oil bycapillarity and effectively hold or absorb any solid impurities carriedby the air which impinges on the threads. They also cause wetting of themetal wire which enables it t hold solid material thereon,

The bottom rows of the composite fabric dip into the oil or liquid inthe sump. Or the textile threads only may dip into the oil or liquid. Orwicks or felt may be attached to each length or pad of composite fabric,such wicks dipping into the oil or liquid in the sump a. The felt mayact as a seal to prevent spilling of the oil from the sump.

The fabric c is shown in vertical sheets but it maybe arranged ininclined or horizontal rows or in any other convenient way to suitrequirements. It may be of straight, crinkled, corrugated or other form.

The fabric is clamped between the recessed outer edges or shoulders onthe frame b and the air inlet funnel d at one side and the pipe e at theother side, or may be held in any other manner suitable for theparticular style and shape of filter used.

What I claim is:

1. The combination with the elbowed inlet pipe end of a carburetor orthe like of a frame open at opposite sides and having recesses along theedges of the openings to accommodate the pipe end at the opening at theinner side, an oil sump carried with the lower end of the frame andprovided with at least one opening communicating with the interior ofthe frame, at least one foraminous sheet of intertwined textile andmetallic threads arranged across the opening of the frame and extendedthrough the opening into the sump, an air inlet funnel accommodatedwithin the recessed opening at the outer side of the frame, and meansfor releasably clamping the parts together.

2. A viscous type air filter of the character described, comprising aframe open at the opposite sides provided with shoulders about the edgesof the openings, an oil receiving sump carried with the lower side wallof the frame and provided with openings in its top communicating withthe interior of the frame, sheets of filtering material composed ofknitted textile threads and fine metal wire arranged against theshoulder edges of the openings of the frame and extended through theopenings into the sump, a pipe connection arranged within the shoulderededges of the opening at one side and against one of the sheets, an airinlet funnel arranged Within the shouldered edges of the opening at theother side of the frame and against the other sheet, and means forremovably clamping the pipe connection frame, inlet funnel and sheetstogether.

HERBERT PEARSON.

